First recorded by Johnny & Jackey (1961).
Hit versions by Diana Ross & The Supremes (US #1/R&B #1/UK #11 1969), Bert Kaempfert (MOR #27 1970), Bill Anderson & Jan Howard (C&W #4 1970).
From the wiki: “The song was written by Johnny Bristol, Jackey Beavers, and Harvey Fuqua in 1961. Bristol and Beavers recorded the song together as ‘Johnny & Jackey’ for the Tri-Phi label that same year. ‘Someday ..’ was a moderate success in the Midwestern United States, but gained little notice in other regions.
Tri-Phi was purchased by Motown in the mid-1960s. Fuqua, Bristol, and Beavers all then joined Berry Gordy’s famous Motown record company, and ‘Someday We’ll Be Together’ became part of Motown’s Jobete publishing catalog. In 1969, Bristol was preparing a cover version of ‘Someday We’ll Be Together,’ to be recorded by Motown act Jr. Walker & the All-Stars. Bristol had already recorded the instrumental track and the background vocals by Maxine Waters and Julia Waters when Berry Gordy happened upon the tracks and heard them. Gordy thought that ‘Someday …’ would be a perfect first solo single for Diana Ross, who was making her long-expected exit from the Supremes at the time, and had Bristol sequester Ross into the studio to record the song.